Windows system does not gives you sound
and audio suddenly or despite sound card or audio device is present and
working previously? Windows XP, 2000, NT, 2003 or even Vista computers may
lost Windows audio and system sounds output due to the mess on file system
or registry that created or left by third party utilities after installation
and uninstallation, or corrupted and missing codecs, a component necessary
to decompress and decode media files so that can be playback by Windows
system.

When the Windows no sound problem occurs, the symptoms include users do not
hear any Windows system sound even though the volume control on speakers
have turned on, and all audio mixers and EQs is not muted. Users cannot hear
sound from mouse start navigation clicks, Windows startup sound, messengerís
user online or incoming message notification alert and etc. Even Flash video
clips hosted on YouTube, Google Video, Dailymotion, CNet Video, MetaCafe,
and etc will not output the sound, even though video playback fine without
problem.

If you have no sound problem only on Flash objects (video on Youtube, Flash
games and etc), try out the Flash no sound registry fix (http://www.mydigitallife.info/2007/08/15/youtube-dailymotion-google-video-flash-games-and-applications-no-sound-and-audio-in-windows/),
especially on wavemapper registry key. Else if you try to uninstall and
install drivers again, restore to previous system restore point, changing
sound card or switch it to another PCI slot will not solve the no sound
problem.
Here is a simple trick to fix Windows system no sound problem. The trick
works by using a tool built into K-Lite Codec Pack.

1. Download and install K-Lite Codec Pack version 3.3.0 full from http://ftp.isu.edu.tw/pub/Windows/softking/soft/en/k/klcodec330f.exe
or http://files.3dnews.ru/pub/soft/multimedia/codec/klcodec330f.exe. You can
deselect most components that you donít need, except Codec Tweak Tool under
the Tools section.
2. After installed, click on Start button, then go to All Programs -> K-Lite
Codec Pack -> Configuration -> Codec Tweak Tool.
3. In the Codec Tweak Tool window, tick the check box next to [Registry] Fix
non-working system sound.
4. Click on Next button, and your Windows no sound problem should be fixed,
and working as usual.

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Software Recognition

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